Here is the full list of all 27 Final Rush achievements.
Play with someone who has this.
Kill 1,000 Enemies.
Win a full match.
Win on each of the original 3 maps, Cargo, Mercury Switch, and Serial
Buy all the upgrades in a single match.
Get a tier 3 RUSH reward.
Get 200 critical hits.
Get a Giga Kill.
Get 100,000 score over multiple matches.
Get the highest level killing spree.
Get 25 critical kills in a row.
Kill 5,000 Enemies.
Beat a level on Extreme difficulty.
Ride 'em for 10 seconds.
Buy an experimental weapon.
Beat Frost on Hard or Higher.
Reach the rank of Initiate
Reach the rank of 13th Seat, Junior
You've reached the limit. For now.
Kill 6 enemies with a single AVLaser shot.
On Core, complete a full match on normal difficulty, without dying.
Buy an armor customization.
Buy 3 full sets of armor.
Upgrade every part of a weapon.
Complete the training skill tree
Respecialize your skills
(It had to be added) Kill a Taser Bot while being Tased.